In article <[EMAIL PROTECTED]> (at Wed, 28 Nov 2007 01:28:04 -0800), "Bill
Kelly" <[EMAIL PROTECTED]> says:
> I'm in the process of trying to debug why getaddrinfo() is
> failing to perform reverse DNS lookups on my etch-amd64
> system. (glibc version 2.3.6.ds1-13etch2)
It is nothing to do with amd64, but the usage;
getaddrinfo() is not for reserve DNS lookups.
For that purpose, use getnameinfo() instead.
--yoshfuji
--- getaddrinfo-test.c.orig 2007-11-26 15:51:17.000000000 +0900
+++ getaddrinfo-test.c 2007-11-28 19:49:33.164757204 +0900
@@ -19,7 +19,6 @@
const char *host = "208.77.188.166"; // www.example.com
const char *port = NULL;
int socktype = SOCK_STREAM;
- int flags = AI_CANONNAME;
struct addrinfo hints;
struct addrinfo* res = NULL;
@@ -28,14 +27,28 @@
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = socktype;
- hints.ai_flags = flags;
+ hints.ai_flags = 0;
error = getaddrinfo(host, port, &hints, &res);
- fprintf(stderr, "sock_addrinfo: error=%d res->ai_canonname='%s'\n",
error, (res && res->ai_canonname)? res->ai_canonname : "NULL");
+ if (error) {
+ fprintf(stderr, "sock_addrinfo: error=%d: %s\n",
+ error, gai_strerror(error));
+ return 4;
+ }
+
+ if (res) {
+ char hostbuf[NI_MAXHOST] = "???";
+
+ error = getnameinfo(res->ai_addr, res->ai_addrlen,
+ hostbuf, sizeof(hostbuf), NULL, 0,
+ 0);
+
+ fprintf(stderr, "sock_nameinfo: error=%d, host=%s\n",
+ error, hostbuf);
- if (res)
freeaddrinfo(res);
+ }
return 0;
}
--yoshfuji
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